溶胶-凝胶法制备xLa-3%In-TiO_2光催化材料  

xLa-3%In-TiO_2 Photocatalytic Material Prepared by Sol-gel Method

作　　者：曲家惠 陈金垒[1] 李红[1] 张文杰[1] 

机构地区：[1]沈阳理工大学环境与化学工程学院,沈阳110159

出　　处：《材料工程》2017年第8期14-18,共5页Journal of Materials Engineering

基　　金：辽宁省自然科学基金资助项目(2015020186)

摘　　要：采用溶胶-凝胶法制备xLa-3%(摩尔分数,下同)In-TiO_2光催化材料,对其进行XRD,SEM,比表面,孔径分布表征和光催化活性评价。结果表明:所制备的样品为四方晶系锐钛矿结构,掺杂La和In样品的TiO_2晶粒尺寸有所减小。In3+,La3+以置换Ti 4+的方式进入TiO_2晶格中。掺杂La后材料的比表面积增大,平均孔径减小。xLa-3%In-TiO_2的孔径主要分布在1.5~10nm范围内。La的掺杂明显提高了材料的光催化活性,甲基橙在0.3%La-3%In-TiO_2和3%InTiO_2上的光催化反应速率常数分别为0.061,0.029min^(-1)。甲基橙分子中的显色基团在光催化过程中可以完全降解。A sol-gel method was applied to prepare ： cLa-3% （mole fraction, the same below） In-Ti0 2 photocatalytic materials,which were characterized by XRD, SEM, surface area, and pore size distri-bution measures. Photocatalytic activity of the materials was also evaluated. The results show that the materials are in tetragonal anatase structure. Crystalline size of TiO2 decreases after doping La and In. In3＋ and La3＋ exist in TiOz crystal lattice by substituting Ti4＋ . La doping results in enlarging sur-face area and shrinking pore size. Pore size of a： La-3 % In-TiO2 is mainly in the range of 1. 5-10nm. Do-ping of La obviously leads to enhanced photocatalytic activity. Photocatalytic rate constants of methyl orange are 0. 061min-1 and 0. 029min_1 on 0. 3% La- 3 % In-TiO2 and 3 % In-TiO2 , respectively. Thechro- mogenic groups in methyl orange molecules can be degraded during photocatalytic process.

关 键 词：TIO2 溶胶-凝胶 光催化 甲基橙 

分 类 号：O643[理学—物理化学]